The Brin-Thompson groups sV are of type F∞
Abstract
We prove that the Brin-Thompson groups sV, also called higher dimensional Thompson's groups, are of type F∞ for all natural numbers s. This result was previously shown for s up to 3, by considering the action of sV on a naturally associated space. Our key step is to retract this space to a subspace sX which is easier to analyze.
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